真核生物mRNA前体的加工过程不包括（　　）A．5末端加帽 B．3 _爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

真核生物mRNA前体的加工过程不包括（　　）

A．5末端加帽

B．3 末端加多聚A尾

C．甲基化修饰

D．磷酸化修饰

E．剪切去除内含子并连接外显子

答案

参考答案：D

选择题

19世纪末20世纪初的亚洲民族民主运动不包括[ ]

A．阿富汗人民的反英起义

B．中国的辛亥革命

C．中国的义和团运动

D．伊朗和土耳其的资产阶级革命

阅读理解

阅读理解。

     It used to be that Christmas, with a little help from Blue Peter, was about adding the personal touch.
We'd sit there for hours making cards and gifts for family and friends, knowing that the thought put into
them would be properly appreciated.
     Nowadays, time is against us, but there is still one easy way for you to make someone's Christmas
this year-a personalised card from M&S' new website.
     To celebrate their new site, M&S is offering Times readers two-for-one on all cards. Simply choose
one of the 300 exclusive (独家的) Christmas designs-starting from ￡1.99, personalise it by changing the
name and writing a message or uploading a photo. Then, add the receiver's address and the card will be
sent for you. Order by 2 pm and it will be posted the same day.
     In all, there are 1500 card designs to choose from, covering all kinds of special occasions. So if you
want to get ahead of yourself for 2010, you know where to visit. You can even choose to be reminded
of those important dates every year.
     To claim your two-for-one on M&S personalised cards, simply visit marksandspencer-personalised
com. Remember to enter the code "TIMESFRI" on the payment page, This code is available for two days.
     TERMS AND CONDITIONS: M&S PERSONALISED CARDS
     1. The product given for free must be of equal or lower value.
     2. Payment of postage is required
     3. Marks & Spencer reserves the right to take back this offer without prior (预先) notice.

1. What does the underlined part "two-for-one" (in Paragraph 3) mean in the ad?

A. Two paid cards and one free card.
B. One paid card and two free cards.
C. Your name and a message on one card.
D. Your photo and the receiver s on one card.

2. From the ad we can know that M&S is most probably _____.

A. a website selling Christmas cards only
B. an agency of the newspaper Times
C. a company promoting the sales of cards
D. an advertising agency of card producers

3. To order the product for your friends now, you should _____.

A. enter a code on the payment page of M&S' website
B. always order it before two o'clock in the afternoon
C. put into the card your own date of birth and address
D. spend time making cards with the help of Blue Peter

4. According to the ad, if you order the Christmas cards, _____.

A. they can be delivered free of charge
B. you can enjoy the special offer all the year round
C. their value may be lower than that of a free card
D. you can get a favor of at least ￡1.99